Attachment for optical instruments.



T. J. JANDA. ATTACHMENT FOR OPTICAL INSTRUMENTS.

APPLICATION FILED JUNE 25, 1910. 973,438., Patented Oct. 18,1910.

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. T. J. JANDA.

ATTACHMENT FOR OPTIGAL INSTRUMENTS.

APPLICATION IYILED JUNE 25, 1910.

i: 973,438, Patented Oct. 18,1910. v

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in the device so as to'permit of a wide range irtrnur rrron THOMAS JOHN .iANnA, or IPITTSBURG, :PENNSYLVANIA.

ATTACHMENT FOR OPTICAL INSTRUMENTS.

Specification of Letters Patent.

Application filed June 25, 1910. Serial No. 568,910.

Patented Oct. 18, 1910.

To all whom it may concern:

. Beit know-nthat' I, THOMAS JOHN JANDA, a citizen of the United States, residing at Pittsburg, in the' county of Allegheny and State .of Pennsylvania, have invented certain new and useful Improvements in Attachments for Optical Instruments, of which eye piece, whereby a compound microscope is provided in the telescope for changing the magnifying ower, the construction being such that di erent power objectives and ifierent power eye piecesmay be employed of use. 7

Another object of the invention is to provide a device or attachment of this character which will not only permit the magnifying power of the telescope to be increased or changed but which may effectively take the place of. terrestrial erecting prisms, being much better than the same, and -at the same time cheaper to construct.

With the above and other-objects in view,

. the invention consists of the novel features of construction and the combination and arrangement of parts hereinafter fully scribed and claimed and illustrated in the accompanying drawings in which' Figure 1 is a side view of the device or attachment. Fig. 2 is alongitudinal section. Fig. 3 is a transverse section taken on line 33 in" Fig. 2. Fig. 4'is a pers ective view of the socket member or tube 0 the device.

Fig. 5 is a detail view of the attaching member or tube, and Fig. 6 is a detail sectional view showing another form of objective that may be used in theattaching tube.

The preferred embodiment of the invention illustrated in the drawing consists of two tubes 1, 2, telescopically engaged and having very fine screw threaded engagement with each other as indicated at 3, whereby they may be adjusted for focusing. The

front or outer tube 1, is adapted to be insen-ted in a telescope-or other astronomical or optical instrument in which the eye piece is to be used, and to limit the inward movementof the tube or member 1, into the'telescope, it is provided adjacent the threads 3 with a stop collar 4. The front extremity of thetube 1, is internally screw threaded at 5,to be engagedby' an externally threaded objective holder or cap 6, the latter containing one or more objective lenses 7. Diffferent kinds of objectives may be applied to the tube 1 for the purpose'of varying the magnifying power of the device.

The rear tube or member 2'is adapted to serve as a socket tube for an ordinary instrument eye piece 8, which nfay contain one or more eye piece lenses 9. .This eye piece 8 consists of a cylinder removably ar ranged in the rear end of the tube 2; and

provided. at its rear extremity with anan- 'nular rim or collar 10, to limit its inward movement into said tube. To more effectively retain the eye piece 8 in position, the

rear end of the tube 2 is preferably formed with three longitudinal slits 11 to increase the frictional engagement betweenthe parts.

Different eye pieces containing different power lenses may be placed in the socket tube 2, according to the degree of magnify ing power desired.

In using the invention, the proper objective and eye piece lenses are arranged at the opposite ends of the attaching and socket tubes 1, 2, respectively, and the attaching tube 1 is-then inserted in the telescope or other instrument in which the improved magnifying eye piece is to be used. The socket tube 2, is then rotated to secure the proper focus.

Among .the many advantages of my invention, may be noted the following: It

increases and changes the magnifying V powers of telescopes and also takes the place ofterrestrial erecting prisms, being better than the latter, and cheaper to construct. The device providesin effect acompound microscope capable of use in various instruments and ca able of-a very wide range of use because ifierent power objectives and different power eye pieces may be employed for varying the magnifying power." Over the present day astronomical and other eye pieces, it has'the advantage that to secure the same magnifying power, it is not necessary to bring thepeye as close to the eye 1 jective piece. Over terrestrial erecting prisms it has the advantage of consisting of straight tubes and also of being much cheaper to construct. a s

In Fig. 6\ of the drawings; I haveshown another fform of objective which may be used in the attaching member 1. This ob consists of outer and inner tubular sections12, 13, which liave. a screw threaded connection witheach other connected at 14 whereby they may be separated to permit oi the cleaning of the two lensesjl5 which they carry, and also to permit sections containing lenses of different power to be interchanged; The outer section 12 has a longitudinally projecting protecting rim 16, while the inner section 14 is externally screw threaded at 17 to screw into the internally threaded end of the attaching tube P.

I claim: t t

1. An attachment of the character set forth comprising attaching and socket tubes having a fine screw-threaded engagement for focusing purposes a stop on the attaching tube for limiting its movement into an instrument, an objective lens holding means removably arranged on the front end of the attaching tube, and an eye piece removably arranged in the rear end of the socket tube, and carrying a lens. 2.- An attachment of the character set forth comprising adjustably engaged tubes, one being adapted for insertion in an instrument, an eye piece removably mounted in one of said tubes, and a. two part. objective reniovably mounted in the -'other tube, the two parts of said objective being detachably engaged and carrying lenses.

Intestimony whereof I hereunto aflix my signature in the presence of two witnesses. THOMAS JOHN JANDA; Witnesses:

MAX I-I. SRoLovrrz, R. PAULIN. 

